Export Excel HttpResponse non funziona

[mexican]

Ciao a tutti ho un problema a far uscire questo Export Excel.
Ho la seguente void

var db = new GMM.DAL.DBLocale();
var listaOperatori = db.Operatori.OrderBy(x => x.idOperatore).ToList();
DataTable myDT = new DataTable(); 
myDT= ExcelUtility.ListToDataTable(listaOperatori);
ExcelUtility.CreateExcelDocument(myDT, Server.MapPath("public/miofile.xlsx"));

Con cui richiamo le funzioni della classe: ExcelUtility

 public static bool CreateExcelDocument(DataTable dt, string filename, System.Web.HttpResponse Response)
        {
                DataSet ds = new DataSet();
                ds.Tables.Add(dt);
                CreateExcelDocumentAsStream(ds, filename, Response);
                ds.Tables.Remove(dt);
                return true;
        }

public static bool CreateExcelDocumentAsStream(DataSet ds, string filename, System.Web.HttpResponse Response)
        {
            try
            {
                System.IO.MemoryStream stream = new System.IO.MemoryStream();
                SpreadsheetDocument document = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook, true);
                using (document)
                {
                    WriteExcelFile(ds, document);
                }
                stream.Flush();
                stream.Position = 0;

                Response.ClearContent();
                Response.Clear();
                Response.Buffer = true;
                Response.Charset = "";

                //  NOTE: If you get an "HttpCacheability does not exist" error on the following line, make sure you have
                //  manually added System.Web to this project's References.

                Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("content-disposition", "attachment; filename=" + filename);                
                byte[] data1 = new byte[stream.Length-1];
                stream.Read(data1, 0, data1.Length);
                stream.Close();
                Response.BinaryWrite(data1);
                Response.Flush();
                
            }
            catch (Exception ex)
            {
                log.Error("Errore CreateExcelDocumentAsStream" + ex.Message, ex);
                return false;
            }
            finally
            {
                Response.End();
            }
           
            return true;
                      
        }


private static void WriteExcelFile(DataSet ds, SpreadsheetDocument spreadsheet)
        {
            //  Create the Excel file contents.  This function is used when creating an Excel file either writing 
            //  to a file, or writing to a MemoryStream.
            spreadsheet.AddWorkbookPart();
            spreadsheet.WorkbookPart.Workbook = new DocumentFormat.OpenXml.Spreadsheet.Workbook();

            //  My thanks to James Miera for the following line of code (which prevents crashes in Excel 2010)
            spreadsheet.WorkbookPart.Workbook.Append(new BookViews(new WorkbookView()));

            //  If we don't add a "WorkbookStylesPart", OLEDB will refuse to connect to this .xlsx file !
            WorkbookStylesPart workbookStylesPart = spreadsheet.WorkbookPart.AddNewPart<WorkbookStylesPart>("rIdStyles");
            Stylesheet stylesheet = new Stylesheet();
            workbookStylesPart.Stylesheet = stylesheet;

            //  Loop through each of the DataTables in our DataSet, and create a new Excel Worksheet for each.
            uint worksheetNumber = 1;
            foreach (DataTable dt in ds.Tables)
            {
                //  For each worksheet you want to create
                string workSheetID = "rId" + worksheetNumber.ToString();
                string worksheetName = dt.TableName;

                WorksheetPart newWorksheetPart = spreadsheet.WorkbookPart.AddNewPart<WorksheetPart>();
                newWorksheetPart.Worksheet = new DocumentFormat.OpenXml.Spreadsheet.Worksheet();

                // create sheet data
                newWorksheetPart.Worksheet.AppendChild(new DocumentFormat.OpenXml.Spreadsheet.SheetData());

                // save worksheet
                WriteDataTableToExcelWorksheet(dt, newWorksheetPart);
                newWorksheetPart.Worksheet.Save();

                // create the worksheet to workbook relation
                if (worksheetNumber == 1)
                    spreadsheet.WorkbookPart.Workbook.AppendChild(new DocumentFormat.OpenXml.Spreadsheet.Sheets());

                spreadsheet.WorkbookPart.Workbook.GetFirstChild<DocumentFormat.OpenXml.Spreadsheet.Sheets>().AppendChild(new DocumentFormat.OpenXml.Spreadsheet.Sheet()
                {
                    Id = spreadsheet.WorkbookPart.GetIdOfPart(newWorksheetPart),
                    SheetId = (uint)worksheetNumber,
                    Name = dt.TableName
                });

                worksheetNumber++;
            }

            spreadsheet.WorkbookPart.Workbook.Save();
            spreadsheet.Close();
        }

Il problema è che non mi apre nessun file alla fine. Non accade niente.
Dove sbaglio?

[mexican]

Ho risolto il problema e che avevo il button nell'UpdatePanel e non avevo messo il trigger